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Lookup NU author(s): Dr Hua Cheng, Emeritus Professor Keith Scott
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Oxidation of methanol at a Pt-Ru/Ti mini-mesh anode has been investigated. The oxidation is efficient giving low anode potential, e.g. 520 mV versus RHE at a current density of 200 mAcm-2. The potentials were lower than that obtained at catalysed carbon cloth anode and at catalysed Teflon-bonded gas diffusion anode, under similar conditions. An outstanding performance was demonstrated by subjecting the electrolytic cell, including the electrolytes, to centrifugal force to enhance mass transfer and to accelerate gas bubble disengagement from the electrode surfaces, the electrolytes and the membrane. The acceleration field caused a significant reduction in the anode potential (up to 500 mV at 300 mAcm-2), compared with a static cell, and increased current density greatly by up to 250 mAcm-2 at 500 mV versus RHE, at a relative acceleration rate of 190 and at 80°C. Increasing the methanol concentration and the electrolyte temperature increased the rate of methanol oxidation. An increase in the concentration of the electrolyte led to a reduction in the cell resistance. These improvements in anode potential were improved further in a centrifugal field, compared to a gravitational field. © 2003 Elsevier Science B.V. All rights reserved.
Author(s): Cheng H, Scott K
Publication type: Article
Publication status: Published
Journal: Journal of Power Sources
Year: 2003
Volume: 123
Issue: 2
Pages: 137-150
ISSN (print): 0378-7753
ISSN (electronic): 1873-2755
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/S0378-7753(03)00526-3
DOI: 10.1016/S0378-7753(03)00526-3
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